codice:
    
Dim isKeyPressOk As Boolean = True
    Dim obj_ClassiPersonali As New classiPersonali.ControlloData.TextBoxData(Me.txt_data, Me.lbl_data, Me.tlt_data, Me.pnl_data)
    Private Sub txt_data_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles txt_data.TextChanged
        obj_ClassiPersonali.m_textChange(e, Me.txt_data)
    End Sub

    Private Sub txt_data_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles txt_data.KeyUp
        obj_ClassiPersonali.m_keyUp(e, Me.txt_data)
        isKeyPressOk = True
    End Sub

    Private Sub txt_data_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles txt_data.KeyDown
        obj_ClassiPersonali.m_keyDown(e, Me.txt_data)
        If Not isKeyPressOk Then
            e.SuppressKeyPress = True   ' mi dà errore qui!
Else 
            isKeyPressOk = False
        End If
    End Sub
vb.net 2003 ovviamente

dice che non è un membro di system.windows.forms.keyeventsargs